ERS_DimD vs Rhythm Ace
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ERS_DimD
This audio plugin emulates the classic Roland Dimension D chorus effect, known for its subtle, airy stereo enhancement. It adds presence to sounds without compromising the original audio structure. Enhanced controls offer more flexibility than the original hardware.
- Emulates Roland Dimension D chorus
- Subtle stereoizing effect
- Adds presence and airiness
- Enhanced control options
- Preserves original sound structure
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The ERS DimD chorus audio plugin was originally designed and sold by Harrie Munnik and his Dutch company EmptyRoomSystems. DDMF is proud to carry on the legacy by distributing and further developing the set of ERS plugins. This plug-in has been developed to sound like the Roland Dimension D Chorus with enhanced controls (a hardware chorus that has been used on thousands of recordings worldwide). It has its own signature sound: it is famous for delivering a subtle, stereoizing enhancing, airy effect while adding more presence to a sound. Most chorus products give a lot of modulation and do not keep the original structure of the sound intact. This chorus is way more subtle and adds something rather than take away the original quality of the sound.
Rhythm Ace
This app is a faithful simulator of a vintage 1967 drum machine, recreating its authentic analog sounds and rhythm presets. It allows for real-time synthesis of percussion, pattern layering, and individual voice muting for unique groove creation.
- Faithful vintage drum machine simulation
- Real-time synthesized analog sounds
- 16 classic rhythm presets
- Authentic pattern combining
- Individual voice cancel controls
- Precision tempo control
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Rhythm Ace is a faithful simulator of the Ace Tone FR-1 — one of the earliest consumer drum machines, built in Japan in 1967 and the ancestor of the legendary Roland rhythm machines. Every sound is synthesized in real time using classic transistor-style audio circuits — no samples, no loops. Just pure, characterful analog-era percussion the way it was meant to sound. Eight synthesized voices Bass Drum · Snare · Low Conga · High Conga · Cymbal · Claves · Cowbell · Maracas 16 classic rhythm presets Waltz, Bossa Nova, Samba, Rock, Swing, Foxtrot, and more — all faithfully recreated from the original FR-1 diode matrix. Authentic pattern combining Select multiple rhythm buttons to layer patterns exactly like the original hardware — the diode matrix OR-combines their steps, letting you build complex grooves from simple presets. Voice cancel controls Mute individual instruments on the fly with the dedicated cancel buttons, just like the original panel. Precision tempo control Large rotary knob for natural, tactile BPM adjustment. Sample-accurate scheduling Built on a lookahead audio clock for tight, rock-solid timing — no drift, no jitter. Whether you're a vintage gear enthusiast, a music producer hunting for retro textures, or just curious what the dawn of the drum machine sounded like, Rhythm Ace brings a slice of music history to your iPhone.
Screenshots
Verdict
The clearest difference is review sentiment: ERS_DimD at 100% against Rhythm Ace's 0%. ERS_DimD also leads on rating (4.0 vs 2.0) and ratings volume (5 vs 1). Rhythm Ace's advantage is price (Free vs $9.99) and update cadence (every 2 months vs every 8 months). On ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Rhythm Ace is free to download; ERS_DimD costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ERS_DimD holds the better App Store score, 4.0 against 2.0. That said, the two scores are not equally well evidenced: ERS_DimD has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of ERS_DimD's written reviews are positive against 0% of Rhythm Ace's.
ERS_DimD ships an update every 8 months, Rhythm Ace every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | ERS_DimD | Rhythm Ace |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.0 (5 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 8 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 9.3 — better | 18.0 |
| Further details — not scored | ||
| Size | 7 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Siedschlag | Tero Aarnio |
Customer experience
ERS_DimD
Rhythm Ace
In-app purchases
ERS_DimD
No in-app purchases
Rhythm Ace
No in-app purchases









